I just boosted my 01 Prelude, and am not getting any boost at all, and I have checked everything, piping, wg, connectors. Well I thought that I would hook up my boost gauge directley to the compressor housing to see the boost coming form there. So I did that and went for a drive, and the gauge stayed at 0 vac, and didn't move at all, even taking it up to 7500rpm, all through the gears- no movement . And my wastegate stays closed and I just am really stumped at what is going on right now, so could anybody help me out with why I didn't see boost from the compressor. Oh yeah, the compressor wheel spins fine, and the turbo is brand new. thanks guys.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BB6-213 &raquo;</TD></TR><TR><TD CLASS="quote">I just boosted my 01 Prelude, and am not getting any boost at all, and I have checked everything, piping, wg, connectors. Well I thought that I would hook up my boost gauge directley to the compressor housing to see the boost coming form there. So I did that and went for a drive, and the gauge stayed at 0 vac, and didn't move at all, even taking it up to 7500rpm, all through the gears- no movement . And my wastegate stays closed and I just am really stumped at what is going on right now, so could anybody help me out with why I didn't see boost from the compressor. Oh yeah, the compressor wheel spins fine, and the turbo is brand new. thanks guys. </TD></TR></TABLE>

Sounds like your vaccum lines might be hooked up wrong. Do you have a vaccum line hooked up to the side port of the wastegate? The top of the wastegate should be left open. Your wastegate won't open til you reach whatever your wastegate spring is or whatever you have your boost controller set to. Make sure the side port of the wastegate is hooked up to a pressure source.

 

Yeah that is exactley how I have it hooked up, but can anybody explain why I cant see boost when the boost gauge is hooked up to the compressor? Thanks for your help Sneakypete

 

so does the car pull hard and the gauge doesn't work or are you not getting any boost? why not just hook the boost gauge up to the intake manifold so you can see what the <U>motor</U> is getting for boost rather than what it starts out at?

 

Ok, the car does NOT pull hard whatsoever, I can not feel any boost at all. I had the gauge at the IM but I wasnt getting any boost so I figured I had an intercooler connector blown off or the wastegate was stuck, so after checking those, I still wasnt getting boost so I thought I would hook up the gauge to the turbo to see if I was even getting any boost at all, so I did that and I still didn't see or feel any boost, because I figuered maybe the turbo is shot, so I don't want to try to fix everything else If the turbo is bad in the first place. And I heat cycled the turbo and did the right brake in procedure, and it spins just fine, so I don't know why it is't showing boost from the compressor.

 

It won't build boost unless everything is sealed and contained. If you have a leak in your piping somewhere, it will not build boost at the compressor. My vote is you're leaking somewhere!

edit: Can you hear the turbo spooling?

 

well all of my intercooler piping connectors are sealed tight, and the only thing I can think of is the BOV might be letting the air out, but it seems to be closed. It is a 1st gen dsm valve with the line going to the intake manifold.
And I CAN hear and see the turbo spooling. thanks for the help

 

Yea, I'm almost positive you have a leak somewhere then. Try to pressurize the piping with a bike pump or something, and listening for the leak.

 

I will do that, thanks alot man!

 

No problem, get to it and keep us updated of the aftermath!

 

Here's a link to help you out:

https://honda-tech.com/zerothread?id=691168

 

Thanks for the link. well I just went out and took a quiet shop vac, and clamped it into the pipe coming off the compressor, and reversed the flow so it blew in there, and I could not hear or feel any leaks, even at the bov, so I started to loosen the clamp in the connector at the throttlebody, and the air started hissing out, so i know that it was getting to the tb without any leaks, so with that, now i do no know what is going on, and the wastegate is closed and I cant tell if it opens when I drive it, but I dont thaink that it would just randomly open before the .5 bar spring lets it, so if anybody has any more insight on this that would be great. thanks

 

How much pressure was the vacuum creating?

 

well, I am not exactley sure, I just wanted to see if I could hear any major leaks, and I didn't think that I should open the throttle to check the psi, I just wanted to hear for leaks, but it is a 7hp vac and puts out some good air, so I think it tested it pretty well, because I dont care if there are small leaks( which there didnt seem to be any), because all I want is to see some boost, so I know its working, cause I can fix the little leaks later, but I am thinking It has to be the wastegate, but I just dont know why it would be opening when it never gets into boost ya know. I just dont know whats up

 

What about taking the vacuum hose off of the WG and see if it builds boost then. I still think there's a leak somewhere

 

I will go try that right now.

 

Ok well I just went and took of the wastegate hose from the compressor to the side port, and went for a drive, and there was no boost and It would only go to about 3 in/hg vac full throttle, so with that given, does anybody know whats up? Oh yeah, I have checked my IC piping like 15 times, and tightened it like 15 times, so I am almost positive it isn't that. Thanks.

 

Well keep this thread updated of what the solution is, because it's driving me nuts I'm still sticking to a leak!

 

Hahah, thanks man, I will let you guys know whats going on. Hopfully I figure it out because it is just pissing me off now , and bump for anybody else with any ideas, thanks.

 

Bump for any more insight to my problem

 

what turbo do u have, junkyard, used, new?

 

Not sure if you said this or not but does the turbo spin freely and all that.. Also are you sure the compressor section is tight against the backplate..

 

The turbo is a brand new Garett T3/T04E, and as far as I can tell the shaft has a little side to side play, and no in-out play, and the compressor is tight against the backplate. Well now that I now that there are no major boost leaks, and the wastegate is closed, ans the turbo is spinning, does anybody know why I dont see bost, even with the wastegate vac line unplugged? thanks for all your help everybody.

 

Find a friend and try a different wastegate. Maybe the wastegate is defective.

I would go over the IC piping another fifteen thousand times though. Even the smallest leaks can cause boost to not build up.

Keep us updated.

Jon

 

You can easily make a wastegate flange block to make sure its not the WG. You dont have to make it look that pretty, but anything roughly that size with two holes will work.